Mt Rainier is the 5th tallest mountain in the Continental United States and highest in the Cascade range, standing at 14,410 feet tall. It is about 54 miles Southeast of Seattle, Washington. Mt Rainier is the most topographically prominent peak in the lower 48 with 13,211 feet of prominence, even more than that of K2! It is also the most glaciated peak in the lower 48 and considered one of the most dangerous volcanoes in the world.